Are my mice breeding?

I have a male and a female mouse in a ten gallon tank. They were originally for my python but i decided to breed them so that my baby snakes had food instead of buying pinkies every week. They have been together for 14 days now. I notice the male follows the female around sniffing her . How can i tell if they are breeding successfully? I've had hamsters when i was younger and they had babies and we didnt purposely breed them but they had babies. I just want to know this: How can i tell if they are successfully breeding. I breed corn snakes, hognose snakes, and ball pythons.